A right angle triangle
An exterior angle of the polygon.
Any polygon with 5 sides or more or a trapezoid that doesn't have a right angle in it or a kite that is not a square.
All polygons can have right angles except for circle and ovulated shapes. The only 'regular polygon' that has a right angle is the quadrilateral.
Many shapes have a right angles. For example, a right angled triangle, square or rectangle all contain at least one right angle. Trapeziums may also contain right angles. Any irregular polygon may also contain a right angle.
A right angle triangle
right angle triangle
Any polygon can have one right angle, for example, a right angled triangle.
Any polygon can have just one right angle, from a right angled triangle upwards.
Any polygon can have a right angle. A right angled triangle is an example.
Ah, a polygon with no right angles is a special one indeed! It's called a scalene triangle, where all three angles are different. Just like in nature, where every shape has its own unique beauty, a scalene triangle brings a sense of balance and harmony to the world of geometry. Remember, there's no mistakes in art or math, only happy little discoveries waiting to be made.
A right triangle.
An irregular septagon: the right-angle will prevent it being regular.
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A polygon is pretty much any enclosed shape constructed of straight line segments connected end to end. The angles do not have to be right. In fact, they usually aren't. A right angle would NEVER be a polygon, as it is just one right angle. In Euclidean geometry a right angle must be accompanied by two acute angles to form a triangle--the polygon with the smallest number of sides.
Any polygon with 4 or more sides can always have a right angle.
There is no specific name, but "right-angled polygon" will suffice.